Support Center - Glossary - Other

Acceleration Rate:
The motor acceleration rate can be increased or decreased by changing this ESC setting through the KDE Device Manager software.
Arming Tones:
This setting enables and disables the safety beeps. These beep indicates the number of LiPo battery cells and when an arming signal is received. This ESC setting can be changed through the KDE Device Manager software.
Back EMF:
The armature in a magnetic field develops a Back Electromotive Force which acts against the applied voltage. The ESC uses this back EMF is used to determine the bell position in sensorless motors.
Bullet Connector:
Bullet Connectors allow quick and solid electrical connections found between the ESC and battery or between the ESC and motor.
Device Manager Adapter (DMA):
The DMA provides the ability to update KDE ESCs to the latest production firmware and allow the customization of advanced options.
ESC:
Electronic Speed Controllers regulate the speed of brushless 3-phase motors by taking a PWM signal and changing the speed of the motor accordingly.
KDECAN:
The UVC series ESCs come with dual CAN bus ports. These ports allows the for the communication between devices and allow telemetry (live monitoring) of critical systems components during flight.
Regenerative braking:
The motor acts as a generator during motor deceleration and the current flowing is maintained by the motor inductance. Rather than having this excess current be transferred into heat, this power is recycled back into the batteries.
Synchronous rectification (aka. Active Freewheeling):
KDE Direct ESCs are optimized to use active-current freewheeling. Active freewheeling works by having the mosfets act as a rectifier (it allows current in one direction but prevents it from flowing in the other direction). The mosfets superimpose the PWM signal to give a partial current flow (when the top fet is on, the bottom fet is off). The freewheeling current forms a loop and makes the ESC more efficient, especially under partial load, by decreasing temperatures and allowing freewheeling currents to flow back into the motor. To allow a smooth transition, active freewheeling is phased in at lower Pulse Widths. Overall the increase in efficiency is ~10% for the overall flight when S.R. is enabled.
Magnetic Pole count:
This represents the number of permanent magnets contained on the motor bell.
Mosfet:
Mosfets are efficient switches that drive the motor phases. The mosfets in addition to the capacitors determine the amperage rating of an ESC.
Motor Timing:
This changes the timing advance ratio used for the motor. A lower advance ratio gives a larger rpm and less torque. A higher advance ratio gives less rpm but more torque.
Multi rotor:
Multi rotor motors are used in drones and refer to 2 or more rotors on the motor.
Opto-isolated:
An opto-isolator allows the transfer of electrical signal by using light. Opto-isolators prevent additional voltage from affecting the signal.
Overload protection:
Overload protection is designed to protect the internal electronics from high continuous-current situations and circuit damage.
PWM:
Pulse Width Modulation refers to the signal sent from a transmitter that the ESC receives and changes the motor speed accordingly.
Stall protection:
Stall protection enables advanced algorithms allowing for the immediate shutdown of ESCs in the case of a propeller impact or alternate unsafe event.
Throttle Calibration:
A process for setting the minimum and maximum throttle inputs for a transmitter. By default, this setting is set to dynamic for automatic throttle calibration.
Dynamic automatic throttle calibration:
Manual allows the user to define the starting and ending pulse widths.
Voltage Protection:
When reaching the target battery cell voltage, an RPM limit reduction can be added to protection an ESCs internal electronics.
UBEC:
The power connected to motor leads is isolated from the control leads on KDE ESCs. A UBEC is a switching BEC (Battery Elimination Circuit) that guarantees reliable power to the control leads. Not all flight controllers require a BEC, please see flight controller compatibility for more information.